Biography
Prof. Ming-Chun Tang
Prof. Ming-Chun Tang
School of Microelectronics and Communication Engineering, Chongqing University, China
Title: Pattern-Reconfigurable, Directive, Electrically Small Near-Field Resonant Parasitic Antennas: From Theory to Practice
Abstract: 
As is known, the constantly accelerating demands of wireless devices to be compact, miniaturized, integrated and multifunctional, have spawned the development of a plethora of high-performance electrically small antennas (ESAs). The research has demonstrated that quasi-Yagi technology and Huygens source principle could provide effective paradigms for high-performance ESA realizations.

In this talk, pattern-reconfigurable technology is applied in the implementation of multifunctional high-performance ESAs. On the one hand, a pattern-reconfigurable, high-directivity, Huygens source antenna is presented. The design incorporates both electric and magnetic near-field resonant parasitic (NFRP) elements with designated arrangement. A set of PIN diodes are installed in the electric element to attain pattern reconfigurability among three directions. The radiation pattern covers a 120° sector in each reconfigurable state, and hence it encompasses the entire 360° azimuth rang. In addition, the antenna provides measured uniform peak realized gains, front-to-back ratios, and radiation efficiencies, respectively, as high as 3.55 dBi, 17.5 dB, and 84.9%, even though it is electrically small: ka=0.92, and low profile: 0.05λ0. On the other hand, a pattern-reconfigurable, wideband, directive, quasi-yagi ESA with flexible characteristics is presented. It consists of a pair of Egyptian axe dipole (EAD) NFRP elements, together with a pair of shaped metallic strips that act as the driven element and are fed by a coaxial cable. Two pairs of PIN diodes are integrated into the driven element to enable the pattern-reconfigurability in opposite positions. The antenna exhibits a wide, ~13.1 % impedance bandwidth and a ~4.42 dBi peak realized gain in both pattern-reconfigurable states while maintaining its electrically small size: ka ~ 0.94. The flexibility of this antenna is tested under different bending conditions by mounting it on cylinders with several different radii and the results confirm that its performance characteristics are maintained under all of them. The simulated and experimental results of these two ESAs are in good agreement. Finally, some conclusions will be drawn.
Biography: 
Ming-Chun Tang is currently a full Professor in the School of Microelectronics and Communication Engineering, Chongqing University, China. His research interests include electrically small antennas, RF circuits, metamaterial designs and their applications. Prof. Tang was a recipient of the National Science Fund for Excellent Young Scholars in 2019. His Ph.D. students received Best Student Paper Awards from the IEEE 7th Asia-Pacific Conference on Antennas and Propagation (2018 IEEE APCAP) held in Auckland, New Zealand, 2019 IEEE International Applied Computational Electromagnetics Society (ACES) Symposium, Nanjing, China, 2019 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, Qingdao, China, and 2019 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference, Taiyuan, China. He is the founding Chair of the IEEE AP-S / MTT-S Joint Chongqing Chapter. He serves on the Editorial Boards of several journals, including IEEE Access, Electronics Letters and IET Microwaves, Antennas & Propagation. He has also served on the review boards of various technical journals, and many international conferences as a General Chair, TPC Member, Session Organizer, and the Session Chair.